Enabling the xmlsitemap_taxonomy module causes a fatal error on the settings page

If you have the xmlsitemap_taxonomy module enabled and visit admin/config/search/xmlsitemap/settings you get this:

PDOException: SQLSTATE[42000]: Syntax error or access violation: 1140 Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause: SELECT v.machine_name AS vocabulary_machine_name, COUNT(:id) AS count_expression FROM {taxonomy_term_data} base INNER JOIN {taxonomy_vocabulary} v ON base.vid = v.vid WHERE (tid > :db_condition_placeholder_0) AND (machine_name = :db_condition_placeholder_1) ; Array ( [:db_condition_placeholder_0] => 0 [:db_condition_placeholder_1] => tags [:id] => tid )  in xmlsitemap_get_link_type_indexed_status() (line 992 of /web/drupal/sites/all/modules/xmlsitemap/xmlsitemap.module).

This is due to the fact that the module is trying to alter a query that already has an explicit COUNT() expression in it.

Resolving the existing @todo for this query (and converting it to a normal count query) fixes the bug and seems to work correctly as well. This is a simple patch, but the fact that it had a @todo in the first place makes me wonder if I'm missing something :)